/*
 * Copyright 2010 NCHOVY
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.krakenapps.mime;

import java.io.UnsupportedEncodingException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.mail.internet.MimeUtility;

/**
 * @author mindori
 */
public class MimeDecoder {
	private MimeDecoder() {
	}

	public static String decode(String input) {
		Pattern pattern = Pattern.compile("=\\?.*?\\?(.*)?\\?.*?\\?=");
		Matcher matcher = pattern.matcher(input);
		while (matcher.find()) {
			try {
				String group = matcher.group();
				String spacePatch = group;
				if (matcher.group(1).equals("Q")) {
					spacePatch = group.replace(" ", "=20");
				}

				input = input.replace(group, MimeUtility.decodeText(spacePatch));
			} catch (UnsupportedEncodingException e) {
			}
		}
		return input;
	}
}